For which of the following elements is it difficult to obtain oxidation state greater than +2?

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answer is A, B, C.

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Detailed Solution

It is challenging to achieve an oxidation state larger than 2 for Cu, Ni, and Zn because after losing two electrons, they will have fully filled d-orbitals, which gain more stability.

For Cu, Ni, and Zn, IE (3)' is often quite high. Because of this, the oxidation state of "+3" is not displayed. Experts' step-by-step guidance will help you eliminate uncertainty and get good exam results.

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